Ubuntu
xorg package

  1. Bug #1654772
  2. Comment #2

Comment 2 for bug 1654772

Revision history for this message
Ewano (i-launchpad-ewano-net) wrote :

Update:

This fault was tracked down to a damaged display port cable. Some of the pins in one of the connectors were bent so badly that I have no idea how it was functioning. A replacement resurrected the affected display.

I can only conclude that there must have been some extra status checking code in one of the updates which introduced a test on the faulty lines. The test returned an erroneous result and triggered the driver to issue an "enter power save" command to that monitor.

This bug can be closed - and I can stop attempting to bisect the Xorg code..